• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Operating point for 6GK5

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Looking at this tube, it's mu is 78, rp is 5400R. It would be a great candidate for a preamp using a trafo, say with 12:1 step down, giving overall gain around 6, 15.5dB. This should give a Zout around 40R, which would give it terrific drive. The only downside would be overload margin, probably not much better than 3Vpp.

Has anyone used this tube, could I ask your experience of the best operating voltages and currents for nicest sound?

Cheers,

Hugh
 
Hugh,
I just put together a little SET amp using the 6GK5 to drive a 1626.
The 6GK5 is battery biased (Nimh) at about 1.3vg/6ma and the 1626 @ 23v/23ma.
I needed the gain up front because my signal source is only 200mv (old computer CD drive line out)
So far I'm liking it a lot.
robert
 
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